Coherency of generators for inter-area modes using digital filter bank and principal component analysis

In the present work, coherent generators participating in an inter-area mode are identified from time synchronized phasor measurements. In the first step, Zolotarev polynomial based filter bank (ZPBFB) is applied on the real power data of all generators obtained from phasor measurement units (PMUs) to decompose the given signal into monocomponents. The mono-components are then given to eigen realization algorithm (ERA) for modal frequency and damping. The decomposed signals of those generators participating in a particular inter-area mode are given to principal component analysis (PCA) for identifying generator coherency. The proposed method is demonstrated on IEEE two-area test system.